Winding drum for hand brakes



Oct. 9, 1934. v lR Q Q'CQNNQR 1,976,267

WINDING DRUM FOR HAND BRAKES .A

Filed Nov. '7. 1932 2 Sheets-Sheet 1 x @D G 'NIMH 0 UCL 9, l934- R. c.o'coNNoR WINDING DRUMl FOR HAND BRAKES Filed Nov. 7. 1932 2 sheets-sheet2 iatented Oct. 9, 1934 r Y' f Pears e #mi er ci r. e it ai i an site asgaranti @FFCE WINDIN G DRUM FR HAND BRAKES Raymond C. OConnor, Chicago,Ill., assignor to Union Railway Equipment Company, Chicago,

lil., a corporation of South Dakota Application November 7, 1932, SerialNo. 641,547

Claims.

tended to -aiord a mounting for the winding drum which will presently bedescribed. 1

The hub 22, at its inner and outer ends, is journalled upon bushings 23,each of which is provided with a iiange 24 which overlaps the 59proximate end of the gear hub, the bushings be- -ing held in position bycontact of the outer and inner housing walls 18 and 19.

The winding drum in the form now being described comprises a base plate25 of irregular 65 contour, but in general of pentagonal coniguration,and provided with `four rivet holes 26 adapted to receive rivets orbolts 27 extending through registering apertures in the web of .the gearwheel. Obviously, where greater facility in removal is desired, boltsrather than the rivets shown can be employed.

The base plate 25 is oifset to afford an inner winding drum section 28which coacts with an outer winding drum section 29 in spaced relationthereto, to afford an intervening groove or channel 30 of suiiicientdepth to receive the alternate chain links 31 which stand in edgewiserelation to the drum and which are connected by the intervening chainlinks 32 which lie atwise upon the surfaces'of the inner and outer drumsections 28 and 29.

The inner and outer drum sections are connected by a series of spokes orweb sections 33, the drum as a whole, including the base plate 25,'being integrally formed as a single casting. The inner drum section 28is provided with an inwardly extending iiange 34 which stands in opposedrelation to a similar inwardly extending iiange 35 constituting part ofthe outer drum section, the two flanges affording the channel walls forthe reception of the alternate chain links.

The flange 35 has formed around its inner edge a circular marginalflange 36 which bears directly upon the outer end of the gear hub andserves to support and reinforce the winding drum at this point, but itwill be noted that the flange 34, together with the spokes or Webs 33,terminate Mechanism of the class to which the present invention belongsincludes a hand wheel and pinion in mesh with the teeth of a gear wheel,which in turn carries the winding drum to which 5 the `brake chain isattached.

The object of the present invention is to provide a winding drum whichis separable from the gear wheel with which it is associated, but whichmay be readily and easily mounted on the hub of the gear wheel orremoved therefrom as occasion may require. By thus making the windingdrum separable from the gear wheel, it is possible to utilize gearWheels of standard size with winding drums of varying size or configuration to accommodate variations in the size of the chain links or in thepower ratio applied to the brake chain.

Furthermore, the arrangement is one which readily permits removal andsubstitution of the parts in case of breakage, and permits the drum tobe made of harder metal ythan the gear, if so desired, to resist wear orbreakage.

Further objects and details of the invention will appear from thedescription thereof, in conjunction with the accompanying drawings,

wherein,-

Figure 1 is `a vertical sectional elevation of the gear assemblyincluding the winding drum of the present invention;

Fig. 2 is a face vie/w of the gear and drum on a somewhat smaller scale,taken on line 2 2 of Fig. 1;

Fig. 3 is a face view of .the drum;

Fig. 4 is a face View of the gear and drum showing 4a slightly modifiedform of construction;

Fig. 5 is a vertical sectional elevation taken on line 5 5 of Fig. 4;

Fig. 6 is a sectional View taken on line 6-6 of Fig. 5; and

Fig. 7 is a sectional view taken on line 7'-7 of Fig. 5.

Referring first to the construction shown in Figures i, 2 and 3, theseparable winding drum 10 of the present invention is associated with aspur gear 11, the teeth of which mesh with a pinion 12 for-med on ashaft 13, the outer end 14 of which is tapered to receive the hub 1.5 ofla hand wheel 15.

The gear 11 is mounted upon a stub shaft 17, the ends of which arecarried by the outer and inner walls 18 and 19 respectively of a housingwhich encloses the operating mechanism. The gear 11 comprises a iiat webor body 28, a toothed rim 21, and a hub 22, which hub is inwardly eX-slightly outside of the surface of the hub to afford a clearance aroundthe hub at all points save the region of contact afforded by the outerdrum sections.

As shown in Fig. 3, the inner and outer drum sections are ofsubstantially polygonal formationv to aiford flat winding surfaces 37upon whichA the intermediate chain links lie latwise, with: thealternatechain links standing edgewiseand within the groove or channelat the angles afforded by the intersection of the flat winding surfaces.The inner and outer sections of the winding drum on one side areextended to afford an anchorage 38 provided with an aperture 39 adaptedto receive a headed anchor pin 40 or rivet which is entered through theterminal link of the chain, and in order to afford access to the innerend of the anchor` pin, the gear 20 is provided with a registeringaperture 41.

In assembling the parts just described, the winding drum will be slippedinto place with its rivet or bolt holes in registering relation withthose formed in the gear wheel, after which rivets or bolts areinserted, which in conjunction with the contact aorded at the outer endof the hub, serve to maintain the parts in rigid relation to oneanother.

The construction shown in Figs. 4 to 7 inclusive is similar to thatpreviously described, in all respects save the method of mounting andholding the winding drum in position upon the hub of the gear. In thisinstance the gear 20 is provided with a hub 42 which is squared at itsinner end 43, the outer end 44 of the hub, however, being round, asindicated in Fig. 7.

The winding drum is formed with a body portion 45, the inner portion 46of which is squared to closely embrace the squared portion 43 of thehub, while the outer portion 47 is circular to closely embrace thecircular portion 44 of the hub.

The winding drum comprises an inner winding portion 48, an outer windingportion 49, and connecting ribs or spokes 50, but the winding surfaceand its relation to the chain are in all respects similar to thatpreviously described, so that further description thereof is deemedunnecessary.

The winding drum is held in position upon the hub by the provision of awasher 5l, which is interposed between the bushing flange 24 and the endof the hub, the washer being of sufficient width to overlap the end ofthe winding drum so as to prevent displacement thereof.

The bushings 23 stand invclose contact with the proximate walls of thehousing, so that when the parts are thus assembled, longitudinaldisplacement of the windingfdrum will be prevented. v The manner ofmounting the drum is obvious from the above description, but in thisinstance it is not necessary to provide any form of positive connectionwith the web of the gear, since the square formation of the hub and drumprevents relative rotative movement between the parts. This form ofconstruction is particularly desirable in cases where it is advantageousto provide for a quick removal or replacement of the Winding drum asoccasion may require.

Although in the forms shown, the drum is oi' pentagonal formationhavingfiat sides which afford desirable contact faces for the chain links, itis not the intention to thus limit the invention, since otherconfigurations of the Winding surfaces are contemplated, and in likemanner the particular methods of mounting the separable winding drum maybe changed or modied within the scope of the appended claims Withoutdeparting from the spirit of the invention.

I claim:

1. In a device of the class described, the combination of a gear wheeland mounting for the same, a hub extending from the gear wheel, awinding drum separable from the gear wheel and removably mounted uponthe hub, and comprising inner and outer sections standing in spacedrelation to one another to afford a channel and to afford inner andouter winding surfaces contiguous to the channel, and a brake chainhaving its alternate links standing edgewise and within the channel andhaving intervening links lying iiatwise upon the inner and outer windingsurfaces, and spaced connecting web members between the inner and outerdrum sections and located at points between the edge standing links.

2. In a device of the class described, t'ne combination of a gear wheeland mounting for the same, a hub extending from the gear wheel, aWinding drum separable from the gear wheel and removably mounted uponthe hub, and comprising inner and outer sections affording at peripheralfaces and spaced to afford an intervening channel, spaced web membersconnecting the inner and outer sections, the outer section contactingthe hub and the inner section being held in non-rotative relation, and achain anchored to the drum and having its alternate links standingedgewise within the channel and the intervening links lying iiatwiseupon the winding surfaces contiguous to the channel.

3. In a device of the class described, the combination of a gear wheeland mounting for the same, a hub extending from the gear wheel, awinding drum separable from the gear Wheel and removably mounted uponthe hub, and comprisf ing inner and outer sections affording flatperipheral faces and spaced to afford an intervening channel, spaced Webmembers connecting the inner and outer sections, the outer sectioncontacting the hub and the inner section being rigidly secured to thegear wheel, and a chain anchored to the drum and having its alternatelinks standing edgewise within the channel and the intervening linkslying atwise upon the winding surfaces contiguous to the channel.

4. In a device of the class described, the combination of a gear wheeland mounting for the same, a hub extending from the gear wheel, awinding drum separable from the gear Wheel and removably mounted uponthe hub, and comprising inner and outer sections affording fiatperipheral faces and spaced to afford an intervening channel, spaced webmembers connecting the inner and outer sections, the outer sectioncontacting the hub and the inner section being provided with a baseflange lying in flatwise contact with the web of the gear Wheel andbeing rigidly secured thereto, and a chain anchored to the drum andhaving its alternate links standing edgewise within the channel and theintervening links lying flatwise upon the winding surfaces contiguous tothe channel.

5. In a device of the class described, the combination of a gear wheelprovided with an outwardly extending hub squared upon its inner portionand circular upon its outer portion, a winding drum comprising inner andouter winding sections standing in spaced relation to afford anintervening channel, and a body portion squared in part on its interiorto iit upon the squared l.,

portion of the hub and circular in part upon its interior to iit uponthe'circular portion of the,

hub, and a chain having its alternate links standing edgewise within thechannel between the drum sections and having the intervening links 1 4.'

lying iiatwise upon the Winding inner and outer drum surfaces.

RAYMOND C. OCONNOR.

